.main{
  padding:20rpx;
  .flex-box-wrap{
    display: flex;
    align-items: center;
    width: 600rpx;
    box-sizing: border-box;
    outline: 1rpx solid blue;
    .box{
      width: 100rpx;
      height: 100rpx;
      outline: 1rpx solid black;
      text-align: center;
      line-height: 100rpx;
      &.box1{
        flex-basis: 300rpx;
      }
      &.box2{
        flex-basis: 300rpx;
      }
      &.box3{
        flex-basis: 300rpx;
      }
    }
  }
}